Electric lunch box



FIG. 1 is a front, top and right side perspective view of an electric lunch box, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings illustrate the portions of the electric lunch box, which form no part of the claimed design. 

CLAIM The ornamental design for an electric lunch box, as shown and described. 